Nicx, the problem you are describing is an issue with the latest SVN of MediaPortal and was discussed above.
EDIT: Also I'd like to point out that simply declaring your stuff is broke without any details or log files is not at all helpful. in the future if you are going to report a bug please try to think of ways to constructively add to the conversation.
After a clean installation (first uninstall then install) of MediaPortal 1.1 RC1, I tried a second time to go for moving Pictures Beta 3. But I'm sorry to say you, that the bug has not dissappeared. It's still seems to me that it will be the same log-error.
I will post tomorrow or some days later again. Then I can report if the error appears also on my 2nd System and will attach some log files.
Hardware/Software Specs of the 1st Systems are:
Ati Radeon 4670
ATI Catalyst 10.2
AMD Processor